Widgets are interactive objects which are rendered inside the content view. Widgets may have the form of buttons, labels, menus, etc. They can be used to clarify something to an author, or to assist them otherwise.
Widgets can be rendered in different positions, called Widget Areas. To place a widget in one of these areas, define a WidgetSubArea. By referring to the same sub-area from different configuration rules, specific widgets in an area can be overridden without affecting other widgets sharing the same area.
A WidgetSubArea can be set to null to disable any widgets configured for it. If an area ends up not containing any widgets, no space will be reserved for it.
See WidgetSubAreaByName for more details and examples.